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Linus Torvalds 279e54536d tty: convert tty_ldisc_ops 'read()' function to take a kernel pointer 
[ Upstream commit 3b830a9c34 ]

The tty line discipline .read() function was passed the final user
pointer destination as an argument, which doesn't match the 'write()'
function, and makes it very inconvenient to do a splice method for
ttys.

This is a conversion to use a kernel buffer instead.

NOTE! It does this by passing the tty line discipline ->read() function
an additional "cookie" to fill in, and an offset into the cookie data.

The line discipline can fill in the cookie data with its own private
information, and then the reader will repeat the read until either the
cookie is cleared or it runs out of data.

The only real user of this is N_HDLC, which can use this to handle big
packets, even if the kernel buffer is smaller than the whole packet.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-03-04 11:37:36 +01:00
..
6lowpan
9p net: 9p: initialize sun_server.sun_path to have addr's value only when addr is valid 2020-10-12 10:05:47 +02:00
802
8021q net: vlan: avoid leaks on register_vlan_dev() failures 2021-01-17 14:16:55 +01:00
appletalk appletalk: Fix atalk_proc_init() return path 2020-08-03 15:48:32 -07:00
atm net: atm: fix update of position index in lec_seq_next 2020-10-31 12:26:30 -07:00
ax25
batman-adv batman-adv: Don't always reallocate the fragmentation skb head 2020-11-27 08:02:55 +01:00
bluetooth Bluetooth: Put HCI device if inquiry procedure interrupts 2021-03-04 11:37:25 +01:00
bpf bpf: Reject too big ctx_size_in for raw_tp test run 2021-01-27 11:55:07 +01:00
bpfilter Revert "bpfilter: Fix build error with CONFIG_BPFILTER_UMH" 2020-10-15 12:33:24 -07:00
bridge net: bridge: Fix a warning when del bridge sysfs 2021-02-23 15:53:23 +01:00
caif caif: Remove duplicate macro SRVL_CTRL_PKT_SIZE 2020-09-05 15:57:05 -07:00
can can: isotp: isotp_getname(): fix kernel information leak 2021-01-17 14:17:05 +01:00
ceph libceph: clear con->out_msg on Policy::stateful_server faults 2020-10-12 15:29:27 +02:00
core bpf: Fix bpf_fib_lookup helper MTU check for SKB ctx 2021-03-04 11:37:33 +01:00
dcb net: dcb: Accept RTM_GETDCB messages carrying set-like DCB commands 2021-01-23 16:04:01 +01:00
dccp tcp: fix race condition when creating child sockets from syncookies 2020-11-23 16:32:33 -08:00
decnet treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
dns_resolver
dsa net: dsa: call teardown method on probe failure 2021-02-17 11:02:28 +01:00
ethernet
ethtool ethtool: fix string set id check 2021-01-06 14:56:48 +01:00
hsr genetlink: move to smaller ops wherever possible 2020-10-02 19:11:11 -07:00
ieee802154 genetlink: move to smaller ops wherever possible 2020-10-02 19:11:11 -07:00
ife
ipv4 udp: ipv4: manipulate network header of NATed UDP GRO fraglist 2021-02-10 09:29:23 +01:00
ipv6 udp: ipv4: manipulate network header of NATed UDP GRO fraglist 2021-02-10 09:29:23 +01:00
iucv net/af_iucv: set correct sk_protocol for child sockets 2020-11-21 14:43:45 -08:00
kcm
key af_key: relax availability checks for skb size calculation 2021-02-13 13:55:02 +01:00
l2tp genetlink: move to smaller ops wherever possible 2020-10-02 19:11:11 -07:00
l3mdev net: Fix some comments 2020-08-27 07:55:59 -07:00
lapb net: lapb: Copy the skb before sending a packet 2021-02-10 09:29:14 +01:00
llc
mac80211 mac80211: fix potential overflow when multiplying to u32 integers 2021-03-04 11:37:32 +01:00
mac802154 Merge tag 'ieee802154-for-davem-2020-09-08' of git://git.kernel.org/pub/scm/linux/kernel/git/sschmidt/wpan 2020-09-08 20:12:58 -07:00
mpls mpls: load mpls_gso after mpls_iptunnel 2020-10-20 21:16:45 -07:00
mptcp mptcp: skip to next candidate if subflow has unacked data 2021-02-23 15:53:23 +01:00
ncsi net/ncsi: Use real net-device for response handler 2021-01-12 20:18:10 +01:00
netfilter netfilter: conntrack: skip identical origin tuple in same zone only 2021-02-17 11:02:26 +01:00
netlabel netlabel: fix an uninitialized warning in netlbl_unlabel_staticlist() 2020-11-14 12:07:57 -08:00
netlink netlink: export policy in extended ACK 2020-10-09 20:22:32 -07:00
netrom treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
nfc tty: convert tty_ldisc_ops 'read()' function to take a kernel pointer 2021-03-04 11:37:36 +01:00
nsh
openvswitch net: openvswitch: fix TTL decrement exception action execution 2021-02-23 15:53:23 +01:00
packet net: fix proc_fs init handling in af_packet and tls 2021-02-23 15:53:23 +01:00
phonet treewide: Use fallthrough pseudo-keyword 2020-08-23 17:36:59 -05:00
psample genetlink: move to smaller ops wherever possible 2020-10-02 19:11:11 -07:00
qrtr net: qrtr: Fix port ID for control messages 2021-02-23 15:53:23 +01:00
rds RDMA: Lift ibdev_to_node from rds to common code 2021-02-26 10:12:59 +01:00
rfkill rfkill: Fix use-after-free in rfkill_resume() 2020-11-12 09:18:06 +01:00
rose rose: Fix Null pointer dereference in rose_send_frame() 2020-11-20 10:04:58 -08:00
rxrpc rxrpc: Fix clearance of Tx/Rx ring when releasing a call 2021-02-17 11:02:28 +01:00
sched net: sched: incorrect Kconfig dependencies on Netfilter modules 2021-02-23 15:53:23 +01:00
sctp net: fix iteration for sctp transport seq_files 2021-02-17 11:02:29 +01:00
smc net/smc: fix direct access to ib_gid_addr->ndev in smc_ib_determine_gid() 2020-11-19 10:59:19 -08:00
strparser
sunrpc SUNRPC: Handle 0 length opaque XDR object data properly 2021-02-13 13:55:12 +01:00
switchdev net: switchdev: don't set port_obj_info->handled true when -EOPNOTSUPP 2021-02-07 15:37:12 +01:00
tipc tipc: fix NULL deref in tipc_link_xmit() 2021-01-23 16:04:00 +01:00
tls net: fix proc_fs init handling in af_packet and tls 2021-02-23 15:53:23 +01:00
unix networking changes for the 5.10 merge window 2020-10-15 18:42:13 -07:00
vmw_vsock vsock: fix locking in vsock_shutdown() 2021-02-17 11:02:30 +01:00
wimax genetlink: move to smaller ops wherever possible 2020-10-02 19:11:11 -07:00
wireless wext: fix NULL-ptr-dereference with cfg80211's lack of commit() 2021-02-03 23:28:38 +01:00
x25 net/x25: prevent a couple of overflows 2020-12-02 17:26:36 -08:00
xdp xsk: Clear pool even for inactive queues 2021-01-27 11:55:10 +01:00
xfrm xfrm: Fix wraparound in xfrm_policy_addr_delta() 2021-02-03 23:28:45 +01:00
compat.c iov_iter: transparently handle compat iovecs in import_iovec 2020-10-03 00:02:13 -04:00
devres.c
Kconfig drop_monitor: Convert to using devlink tracepoint 2020-09-30 18:01:26 -07:00
Makefile
socket.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-10-05 18:40:01 -07:00
sysctl_net.c